郑州激光治疗近视多久可以当兵郑州弱视治疗需要多少钱,郑州弱视怎么治疗,郑州近视治疗法,郑州成年眼睛斜视手术多少钱,郑州斜视好纠正吗,郑州眼科专家排名,郑州郑州眼科研究所哪医院

Airbnb is doing its part to help stop the spread of the coronavirus.In a press release, Airbnb said they are banning all bookings for entire-home listings in the U.S. and Canada that occur over the Halloween weekend to protect the public's health.If guests previously booked to stay somewhere that fits that criteria, Airbnb said the company would reimburse them."The great majority of guests are respectful of our hosts' homes and neighbors, and we understand that this initiative will disrupt many one-night reservations that might not have led to parties," Airbnb said in the press release. "This action is designed to help protect our hosts and the communities they live in. We will also be introducing additional measures to complement the two-night minimum in an effort to stop as many large gatherings as possible."Airbnb said anyone who violates the policy could have their account removed or face legal action. 927

After a group of demonstrators posted Fox News Host Tucker Carlson's home address on Twitter, the network stopped tweeting.It is seen as a silent protest from the network, according to Politico. The account has 18.3 million followers, which gives it a huge audience reach.Fox News hasn't officially said why it stopped tweeting. There have been no tweets from the largely followed account since Nov. 8.Politico reports 1.4 percent of FoxNews.com traffic in October came from Twitter, including all of the network's official accounts. That information comes from a tracker called SimilarWeb.Data shows nearly 70 percent of FoxNews.com traffic is from direct clicks on the website. Twitter may not be providing enough meaningful impact to the network's digital business, experts say. 809

According to a recent paper, the Earth is caught directly in the crosshairs of a cosmic hurricane.A swarm of nearly 100 stars, accompanied by an even greater amount of dark matter, is aimed directly at our stellar neighborhood and there's nothing we can do to stop it; in fact, the vanguard is already upon us. This sounds like a perfect summer blockbuster movie, starring The Rock and Chris Pratt, or maybe Scarlett Johansson and Charlize Theron.Except this is for real. But is it a danger? Well, actually, no. Not at all. But it's potentially incredibly fascinating, with lots of interesting scientific interconnections. So, what is really going on?The story starts last April, when the Gaia satellite announced the locations and trajectories of 2 billion stars in the vicinity of the Milky Way surrounding our sun. They released the data to the public.Scientists were then able to look at the data set to see if they could spot anything peculiar. In galaxies like the Milky Way, the most common behavior is that the stars orbit the center of the galaxy in a manner broadly similar to the planets orbiting our sun. However, there are some stars that exhibit unusual motion. About a year ago, astronomers identified some "stellar streams" passing through our celestial neighborhood.One of them, called S1 (for stream 1), consists of nearly 100 stars of similar age and composition, orbiting the Milky Way in a direction exactly opposite that of normal stars. It's kind of like a handful of cars driving the wrong way down the highway, except with a much greater distance between them and with no likelihood of a collision. These stars are spread out over a few thousand light years and they will pass through the solar system's neighborhood over the course of a few million years.Astronomers identified S1 as being part of the remnants of a dwarf galaxy that collided with the Milky Way and was consumed in an epic episode of cosmic cannibalism. Dwarf galaxies are very small, typically about 1% the mass of the Milky Way. They can orbit larger galaxies and collide with the bigger galaxy, adding their mass to the parent. This is what appears to have happened in the case of S1, although the process has taken probably a billion years.Dwarf galaxies often have a disproportionately large fraction of dark matter. Dark matter is a hypothetical and still-undiscovered form of matter that interacts only gravitationally. Scientists have proposed its existence to explain many astronomical mysteries, for example the observation that most galaxies rotate faster than can be explained by the known laws of physics and the stars and gas of which they are composed.While dark matter has not yet been observed, hypothesizing its existence is the simplest and most economical explanation for myriad astronomical mysteries. Averaged over the entire universe, dark matter is thought to be five times more prevalent than the ordinary mass of stars and gas and planets.In dwarf galaxies, the fraction of dark matter is often higher. In Fornax, a well-studied dwarf galaxy orbiting the Milky Way, researchers estimate that the dark matter is between 10 and 100 times greater than the mass found in its stars.If that number holds for S1, the dark matter of the S1 stream is passing through the Earth at a much higher velocity than the more ordinary dark matter that orbits the Milky Way -- about twice as fast. It is thought that S1 dark matter is flying through the solar system at a speed of about 550 km/s, or about 1.2 million mph. While these numbers are impressive, they are misleading. Dark matter, if it exists, is extremely diffuse and it will have no discernible effect on the solar system.Because dark matter hasn't been observed yet, these velocity numbers are speculative, although they are strongly supported by a very large body of evidence. However, the prospect of high velocity dark matter flying through the Earth has suggested an opportunity to detect it.In a paper in the prestigious journal Physical Review D, researcher Ciaran O'Hare and his collaborators calculated the possibilities of discovering dark matter using both existing and proposed dark matter detectors. They considered two varieties of dark matter particles: a very heavy kind called a WIMP (weakly interacting massive particle) and a very light kind called an axion. Because the ultimate nature of dark matter is not known, it is important to be open to all possibilities.They found that the detectors they evaluated could find WIMPs for certain ranges of the particle mass. However, when they looked at the axion possibility, it appeared the prospects were even better. Because of its light mass and the manner in which an axion would interact with the detector, the apparatus simply has a better chance of seeing the axion. (If axions exist, of course.)Experiments with names like ADMX, MADMAX and ABRACADABRA are able or will be able to search for the signatures of dark matter proposed in the recent paper. They consist of technologies that are designed to interact with axions in a strong magnetic field and convert them to ordinary microwaves or radio waves that can be easily detected.It's important to remember that the S1 stream poses no credible threat to the Earth and humanity. There is no need for an action hero to save us. However, the synergy of science is staggering. A careful catalog of nearby stars has opened the prospect of a better possibility of finding and identifying dark matter, which is one of the great unanswered mysteries of modern physics. It's an amazing time we live in, in which we can study such things.\ 5625

A woman in Tallahassee, Florida is accused of drawing a gun on another shopper at a Publix grocery store last Sunday after the victim cut in line, the Tallahassee Democrat reported. According to a report of the incident by the Leon County Sheriff's Office obtained by the Tallahassee Democrat, Jessica Mock, 36, was about to check out at the Publix, but had forgotten an item. She left her cart in line to retrieve the item. When she returned, another customer had gotten in line in front of her. After Mock and the other female customer argued, the other woman got in another line. According to the report, the customer told Mock, "I'll meet you outside." Mock responded, "I'll see you outside."Once outside, Mock is accused of pulling a gun out of her waistband on the shopper. Later, the victim drove away and called law enforcement while Mock allegedly followed the woman. That is when police caught up to Mock. Mock denied pulling a gun or intentionally following the woman, but law enforcement did find a firearm. Mock was charged with aggravated assault with a deadly weapon without intent to kill, according to the report given to the Tallahassee Democrat.  1233

A woman goes berserk, bashing the windshield of a white car in the middle of traffic in the middle of the day. "The girl was pounding, trying to get the other girl out of the car," said Priscella Bautista, an eyewitness.Bautista, her fiance and their two-year-old son were driving in Las Vegas on Friday afternoon when they saw a case of road rage gone wild. “We had our kid in the car. It was scary," said Bautista said, who did not want to show her face on television. Bautista watched in horror but kept rolling as the woman wielded her bat like she was swinging for the fences. The woman inside the white car was petrified. "I wouldn't expect to see anything like that at all," Bautista said.The driver of the attacker's car got angry with Bautista. "When he seen me recording, he yelled at me and said ‘can I help you?’ and I said ‘no we're just recording.’ I said ‘we don't want no problems,’" Bautista said.Once she was done with her major league automotive attack, the woman with the bat casually walked back to her car. "I was thinking they're probably going to come after me too but they didn't. They drove away pretty fast," Bautista said, hoping someone sees the video and recognizes the attacker."I really hope they get caught,” Bautista said. "If that was me in that situation. I hope somebody would’ve helped."The driver inside the white car was unhurt.  1397